TY - JOUR
T1 - Developing Efficient Dinuclear Pt(II) Complexes Based on the Triphenylamine Core for High-Efficiency Solution-Processed OLEDs
AU - Sun, Yuanhui
AU - Liu, Bochen
AU - Guo, Yue
AU - Chen, Xi
AU - Lee, Yi Ting
AU - Feng, Zhao
AU - Adachi, Chihaya
AU - Zhou, Guijiang
AU - Chen, Zhao
AU - Yang, Xiaolong
N1 - Funding Information:
The authors acknowledge financial support from the National Natural Science Foundation of China (51803163, 21875179, 21602170, and 21572176), the Natural Science Foundation of Shaanxi Province (2021JM-023, 2019JZ-29, and 2019JQ-188), and the China Postdoctoral Science Foundation (2016M600778 and 2020M673369). The characterization assistance from the Instrument Analysis Center of Xi’an Jiaotong University was also acknowledged.
Publisher Copyright:
©
PY - 2021/8/4
Y1 - 2021/8/4
N2 - The various applications of dinuclear complexes have attracted increasing attention. However, the electroluminescence efficiencies of dinuclear Pt(II) complexes are far from satisfactory. Herein, based on the triphenylamine core, we develop four dinuclear Pt(II) complexes that cover the emission colors from yellow to red with high photoluminescence quantum efficiencies of up to 0.79 in doped films. The solid-state structure of PyDPt is revealed by the single-crystal X-ray diffraction investigation. Besides, solution-processed OLEDs have been fabricated with different electron transport materials. With higher electron mobility and excellent hole-blocking ability, 1,3,5-tri(m-pyridin-3-ylphenyl)benzene (TmPyPB) can help to realize good charge balance in related OLEDs. In addition, angle-dependent PL spectra reveal the preferentially horizontal orientation of these dinuclear Pt(II) complexes in doped CBP films, which benefits the outcoupling efficiencies. Therefore, the yellow OLED based on PyDPt shows unexpected high performance with a peak current efficiency of up to 78.7 cd/A and an external quantum efficiency of up to 22.4%, which is the highest EQE reported for OLEDs based on dinuclear Pt(II) complexes so far. This study demonstrates the great potential of developing dinuclear Pt(II) complexes for achieving excellent electroluminescence efficiencies.
AB - The various applications of dinuclear complexes have attracted increasing attention. However, the electroluminescence efficiencies of dinuclear Pt(II) complexes are far from satisfactory. Herein, based on the triphenylamine core, we develop four dinuclear Pt(II) complexes that cover the emission colors from yellow to red with high photoluminescence quantum efficiencies of up to 0.79 in doped films. The solid-state structure of PyDPt is revealed by the single-crystal X-ray diffraction investigation. Besides, solution-processed OLEDs have been fabricated with different electron transport materials. With higher electron mobility and excellent hole-blocking ability, 1,3,5-tri(m-pyridin-3-ylphenyl)benzene (TmPyPB) can help to realize good charge balance in related OLEDs. In addition, angle-dependent PL spectra reveal the preferentially horizontal orientation of these dinuclear Pt(II) complexes in doped CBP films, which benefits the outcoupling efficiencies. Therefore, the yellow OLED based on PyDPt shows unexpected high performance with a peak current efficiency of up to 78.7 cd/A and an external quantum efficiency of up to 22.4%, which is the highest EQE reported for OLEDs based on dinuclear Pt(II) complexes so far. This study demonstrates the great potential of developing dinuclear Pt(II) complexes for achieving excellent electroluminescence efficiencies.
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U2 - 10.1021/acsami.1c06148
DO - 10.1021/acsami.1c06148
M3 - Article
C2 - 34283914
AN - SCOPUS:85111492033
SN - 1944-8244
VL - 13
SP - 36020
EP - 36032
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
IS - 30
ER -